We see a little more of the Bolar Federation*, in their roles as "probably a regional power who want to do regional power things" until they come running up against the Dark Nebula forces (which harkens back to the original plotline of the Bolar Federation beyond "Here's the latest flavor of 20th century antagonist space aliens, after Prussians and the Golden Horde, these ones are Eurasians" I think?). That would suggest, via whatever means, they were able to keep from total annihilation by the hands of Gamillas since at least before 2199 (since it seems clear from Dessler's most recent plot arc than the Gamillan Empire was well aware the Bolar Federation controlled their ancestral home world, and that wasn't that new of a sticking point), either by keeping their heads down, or by means of a nonaggression treaty (formally or an informal one, like the fact they occupied Garmann), or some geographic condition (it occupies the Sagittarius Dwarf Galaxy; maybe it was much harder to travel there rather than the Milky Way Galaxy until 2205, when Dessler did his thing). Likewise, since a pretty deep alliance existed/exists between Earth and the postwar Gamillas Empire, it makes sense that the Bolar Federation would be at least hostile if not in an outright shooting war with Earth.
There's a third Bolar Federal Navy character introductions on the page (who isn't featured in the trailer), the obligatory "macho bearded navy man of few words" that each armed force in SBY is contractually obligated to have, Djerba Gundan (?) who is described as "the commander of the Ganonda-class space carrier, Labrakov", which a much more psuedo-Russophone or Eurasian kind of name that you might expect with the clasisc Bolar aesthetic. Of the three, he's also the only one who wasn't attached to the defeated occupation over Garman.
They're (another) group of green humanoids; in the original series, they were the same sort of "indistinguishable and biologically compatible" as Gamillans compared to humans. It's fun to speculate that that the green non-Gamillan woman in Zoellik's slave girl harem is actually a Bolar national--as opposed to a Gatlantian, since Gamillas had large numbers of Gatlantian prisoners who didn't self-destruct, though that might also be true; or both could be true, if we borrow from the original explanation of the Bolar Federation as a nation of distinct people who gradually discarded their distinct identities in favor of the Bolar moniker, and the "green skin" phenotype comes from being mortal offshoots of the White Comet Empire like we saw in Ark of the Stars or something similar.
Anyway, still looking forward to it!
*Already probably established, but still called "Bora Renpo", literally the same form of 連邦 as is used for the Japanese for "Earth Federation" (of Mobile Suit Gundam) and the Soviet Union (of our history). This could just be "doing the easiest thing", but if you wanted to speculate, renpo's context as "federation or federated state", in contrast with 連合, rengo, for "allies" or "allied party", as in "the United Earth Sphere Alliance" (of MS Gundam Wing) or "the Allies" (of our Second World war history). So the Bolar are another sovereign state, like Earth's or the Gamillian Empire, albeit a formally federated one.